See also The Linux Memory Manager: https://linuxmemory.org/chapters Last update the author sent out was in early July noting that the book is now in editing:
> I am happy to report that I have completed the first draft of the book [...]
> I am now in an editing phase, which may well take some time. Sadly I can't give a reasonable estimate as this will be done in concert with my publisher.
I cannot remember (or find) where I signed up for updates, but I get an email every 6 months (or so) from Lorenzo Stoakes personal email. Probably just send him an e-mail and he'll add you to his list.
> I am happy to report that I have completed the first draft of the book [...] > I am now in an editing phase, which may well take some time. Sadly I can't give a reasonable estimate as this will be done in concert with my publisher.